Lining for rope-and driving pulleys



Sept. 28, 1943.

E. U FFELMANN LINING FOR ROPE-AND DRIVING PULLEYS Filed April 7, 1941 2 Sheets-Sheet 1 M ;I'f

Awe/Mar: iml/ Uf/ e/mann Sept, 28, 1943. E. UFFELMANN LINING FOR ROPE-AND DRIVING PULLEYS Filed April '7, 1941 2 Sheets-Sheet 2 Patented Sept. 28, 1943 s 7 2,3305%: n nmmalmmnonha ANDl-DRIYINGrBULEEESa megawatt nee ApplicatiomApnilfl; 1941-; snmmosateszal- In Ge zmagy Maliclxifialfll t-i' Thelinvent-ion. relates 110;. a; lining.- for. rope and dmiving pulleys; especially. for driving pullt-tys; of hoistingmachines.for mineslofthatityp s imwhich the lining. consists .of a rrcwiofi blocks mounted the one. behind the-otherv in the-.lci rcumferen-tial-idiicircumterentialx direction nor be-thrownoutin radial direction by; thev effect of the centrifugal force Even if the'l-ining at thelbuilding in sits fast, such aloosening mostly occurs however, afterslight wear, so -that bythecentrifugal force effect or by the action of thetrope itselfpartsof theilining are thrown-out.v 1

In a known lining of thisttype for driving pul leys, the clampingof thefllining' blocks isefiected' by; laterally arrangedWedgesiwhich form s, wedge ring, each segment having to be -tighteneri hyscrews This construction possesses theinconvenience, that the. thickness-of the pulley is great and consequentlyathe weight ofthej same-irrcreased. When liningiblocks are used which are insertecl'- into. an undercut groove-of thedriying;

pulley or I'ODGePUHB'Y; it is neeessary'tq'widen the groove ataleast at onepoi'nt-of the ioulley-to form a pocket, to make possible theinsertingwtthelining. blocks. Thispocket measured in its Gil?- cumferential. direction must correspon l=:at-least to thelength of the liningblocks.- The v insertingf of the liningrblocks fromthistpocket is diflicult and complicated; especially if accurately fittingblocksor-pressed seatinghaslto beemployedt Qnei block after, the othenmust thenlce driv'emi n by" diflicultiwork in the circumferential direction by} meanstofsblowstofsa hammer for overcomingthe e c s r te d dr imm trthe blockea e videaat st by cu t tsp enflfilfi tnd ng alt-am acute ans e o them m iatcimc iwepartslthattheselpartstareiabsolutehn similan 'l-he angleiormedz bytithe cutting plane relative to. the cineumierentialtdihection mayi be .selectedrdifier ently It2 isbestx thatrsubdifision isimade so. that theegreatesttwidth OfUthEz-hlDGKpfiIltSshat-equal or slightly smaller thanathee smallestizwidth'- of: the groove in the disc.

' The insertingtofi the blocksaaccordingtoxtheinve'ntionintoea'm undercutr groove- -is efiected in such 1a manner that first: one i haltof: the; first blockaistinsentech upeto. vatpredeterminedl point of the pulley, for instancmagainst' a previouslyl insented enck block. The other halfi-of this first block isathem inserted land. "by v a hammer blow A: solidt clamping .relativ to the side walls of; the grooveis therebyiattained. Additionalclamping wedges on ther'like areonO:--10ngl required-. In practice the dimensions Lofzthewidth of-thehlock parts.ewillapneterably be selected-sothat: in the clamped statwa slight possibility of: tightening stillaremains-e As scenes; the pulleyis "used; a furthen automatic.- reclamping takesplacebythe effect of thelr ope: Imthisi mahner an absolutely flxed seataof th'e lining blocks in; the grooyeis; attamedr- The pocketiinecessar gfon the" inserting neednotgbe 0t the'sameslengthyasthe blocks; as was necessavy -up to thapresent hut it-is-possible to; makettheablocks longer; fon instance twice; or threetimes t as along as the pocket". When all blocks have been; inserted; the poclget is -fi1le d* by an end; block. 7 'I hisend hloclg-neednot be wedg'e shaped;- Any differences-in the circumferential lengthacan be equalizeqby inserting one or seyr erarTfitted blocks' magie-oi the same materialas theJi'ninga An advantageeitheinvention consists in; that itisno longernecessary to provide apoclsje t which is=: widen-than the groo'veirgi the-drivingpizlley, as owing: to the subdivision of the; llhing blocksi the inserting. is possible alsowithoutslich a when; ing. The small gap which -finally remains in the circumferential direction is then; filledf-by am'end piece, with interposition ofl a lateral Wedge The wedgecanr thembe securednagainst flying loutin radial direction in knownmanhen by anoverlap ping plate on:ledge Which- -is dixed of; the drivin nu-lleye Such ledgeslaratobe mounted on-- the whole circumterence of thepu-Hey; if the inventiom isl-to be applied; to; .t such.- constnuctions; in whichtthel g-rooyein the driving pulley isriot una dercut. 7

Ecrzazfurthen improvement the-invention orig- V atcdifromuthe knownideaohmakingthelparts; islpractical, if the-sghgav sigg ismacla'ohlmiimmlos 0f the blocks of materials of different hardness and friction when the blocks are subdivided. In a known driving pulley of this type the lining proper is arranged in wooden frame segments.

blockparts consisting of a material of greater, hardness all .on one side of the pulley, that is on the side of the rope deflection. Thereby 'wear."

is strongly reduced just on theside of the rope deflection and displaced to theother side,;so that provided according to the invention, i. ;e., with cutting plane extending obliquely to the'cir'cum ferential direction, because, when the cutting plane extends in circumferential direction,i the rope would practically run only won .the block halves of little hardness, whereas .according' to theainvention. also th'ecblock halves possessing greater. hardness areutilized in sufficient measure. l a

Another:- improvem'ent: results, --if:-the' block parts lying the one behindithe other/in the cir- .oumferential direction-are mortised the one with the other by tongue and; groove: situated nearthe bottom of'the drivingrpulley. In this manner theiflying out of lining blocksis avoided which otherwise may occur 'on strong wear, particular? 1y on one-sided wear =This measure is especial? ly important :for dovetail-shaped'blooks;- 1 A prac tic'aln-embodiment' of the invention is obtained ifithe block parts near the bottom'of the driving pulley have a laterally projectingfledge extend: ing in circumferential direction and engagingin a tapered recess of the drivingpulley, so that the edge of the ledgei's pressed; against. the; wedge face of the recess. .In this manner upsetting :of the material of theliningtakes place on this wedgeface at the drivin'gein of the blocks,- the" material of the liningbeing: partly pressed into the wedge-shapedghollowy space of the: recess. In this manner the; clamping of the-blocks in the groove of the driving pulleyis further imp'roved. The idea of the invention cana-.be-applied onlining blocks of any material, 'thatis on elastic bloeksas well ason rigidblocks. .Thisidea-isv especially material for'blocks of metal, preferably lightmetal such -.as aluminium and aluminium alloys. For blocks of yieldable materialsuch 'as fabric or rubber, it is advisable to equipthe block parts. in the separating plane, whichmeans on the sliding face,- with a reinforcement of a mate rialof little friction; especially metal. 'This're-t inforcement is requiredonly for the halves of the.- block parts--Which-at the' drivingein come first intotouch the one with'the otherg I .By the lining according to the inventionit is further obtained that, when the groove in-th'e; driving pulleyis undercut, a'recess of theilength' of the gap remaining,- after all :blocks' ha've' 'been insertedneed be provided only in "one's'ide wall of'the' pull'ey thisrecess being adaptedtoitakef up a wedge or a fittedblock for securingv in posi-' tion-the end piece 'insertedkin'to' the'gap. The

production of the-pulley is thereby considerably simplified.

-An embodiment of the 'invention'is illustrated byway of exampleintlieaccompanying drawings, inyyhigh ,15 running on of the rope on the metallic rim of the pulley is prevented. This construction can. be carried out only, if the kind of subdivision is-- Fig. 1 shows diagrammatically a driving pulley with lining,

Fig. 2 in top plan view the disc crown with built-in lining, 5 Fig. 3 shows how the lining is inserted,

Figs. 4 to 6 and 8 cross-sections through the lining with pulley-grooves of different kinds,

Figs. 7 and 9 cross-sections corresponding to Figs. 6 and 8, however at the point at which the 10 end piece is to be inserted,

Figs. 10 and 11 details in cross-section, and

' Fig. 12 the wearing proceeding of the lining on a pulley with obliquely engaging rope or rope deflection.

As shown in Fig. l, a number of lining blocks 3 ar'e'inserted in a groove l of a pulley 2. The lining is securely held in its position by an end .piece 4, the circumferential length of which is shorter than that of the other lining blocks. As can be seen from Fig. 2 and the following figures,

each of the lining blocks 3 consists of at least two parts a and b. The subdividing plane of these block'parts a and b is situated in an acute angle relative to the circumferential direction y 5 of the groove I of the pulley, so that these parts a;and'b are jammed or clamped in the groove i when-they are pushed the one against the other. The total width of both block parts is preferablyyslightly greater than the width of the groove. Herefrom results the possibility, that the block halves, when the pulley operates, are still more strongly pulled the one against the other approximately by the measure 2 by the pull of the rope and can be jammed. The blocks 3jcan'be. inserted, as shown in Fig. 3, without difiiculty at any desired point of the circumferenceofwthe pulley. The block part a is first inserted and brought to bear against the wall of the roove. The block part b is then inserted into the groove from above and pushed against the block part a and driven-in by a blow of a hammer. The inserting of the next following blocks is effected in similar manner. There remains finally a gap of approximately the length L, which is necessary for the inserting of the last block part b. The length 'of this gap changes with the selection of the angle of the cutting plane ar-x relative to the circumferential direction 1/. This length of .the gap is, however, in most instances considerably shorter than the length of the-blocks 3. The gap is filled by the end piece 4. This end piece is preferably made inone part and of a width approximately equal to or smaller than the smallest groove-width of the pulley at this point. The lateral gap which still remains after the end piece has been inserted is filled by a wedge or fitted block 5, whereby dropping out ofthe end piece is avoided, which on oneside is securely held in the undercut pulley groove. The fitted block or wedge 5 issecuredagainst dropping out by a short ledge 6 fixedby screws-on the rim of the pulley. In order to avoid overlapping of the safety ledge 6 into-the lining; a recess 1 of the length of the end piece is provided on the rim on one side wall of the groove, and the end piece is of such width that the wedge or the fitted block 5 fills wholly or partly'this recess 7.

The Figures 4 to '7 show the building-in of the lining in pulleys of known type. The pulley shown in Fig. 4 has a groove of rectangular crosssection. The end piece can then be of the full width of the groove in the pulley. The whole lining is secured against flying out by ledges 8 engaging over the groove edgeon thewhole circumference and fixed on the rim. According to Fig. 5, the groove I in the pulley, which as such is rectangular, has inwardly projecting ledgelike edges 9. Consequently, the lining blocks have corresponding recesses in the sides. In Figs. 6 and 7, the groove is undercut dovetail-like. In the embodiments shown in Figs. to 7 a lateral wedge or fitted block 5 is again necessary for the end piece 4, as shown in Fig. 7.

In the forms of construction shown in Figs. 8, 9, 11 and 12, the groove I in the pulley, which as such is rectangular, has lateral recesses ID on the bottom, which recesses are wedge-shaped towards the outerside. Ledges I I, for instance of rectangular cross-section, of the blocks 3 or of the end piece 4 engage into these recesses. The edge I2 of this ledge presses, at the inserting of the blocks, against the oblique faces of the recesses II] in being deformed, so that the blocks are seated rigidly clamped in the groove of the pulley also in radial direction. The lining blocks have preferably near the bottom of the pulley a tongue and groove I3, similar as shown in Figs. 6 and 10. Hereby is prevented, that at excessive wearing of the [lining block parts are detached and flung out. The block parts a and b may be made, of material of different hardness and of different friction. According to Fig. 1, the block parts a are the softer parts and the block parts b the harder parts. The harder block parts are'arranged always on the same side of the pulley, that is on the side of the rope deflection. By the special shape of the block parts the material of both block parts is also distributed over the whole width of the groove. Hereby it is prevented that the lining becomes worn out too rapidly, i. e. the

lining is utilized approximately on the whole depth, similarly as shown in Fig. 12. If the material ior both block parts were similar, the lining would be worn in the depth at I4 after a short use so that it ought to be exchanged or the pulley edge would be damaged.

I claim:

1. Lining for driving pulleys consisting of blocks placed one behind the other and clamped in the circumferential direction of the pulley, in which each block is subdivided at least along a cutting plane extending at an acute angle to the circumferential direction of the pulley, and in which the block parts consist in known manner of materials of difierent hardness and friction, the block halves of a material possessing greater hardness being all arranged on that side of the pulley on which the rope deflection takes place.

2. A drive pulley with grooved rim and diagbetween the first and the last inserted lining block, and a member for holding the end block in said groove, said member engaging a recess in a side wall of the groove.

3. A drive pulley with grooved rim and diagonally subdivided lining blocks circumferentially disposed in the groove and secured therein, said lining blocks being of metal and of a width somewhat greater than the width of the groove when adjacent ends of their subdivisions lie in the same planes, whereby when the blocks are in operative position in the groove lateral joint gaps are formed between halves of consecutive blocks, all

said blocks being operative drive blocks, the lining blocks being secured in the pulley groove by means including an end block closing the gap between the first and the last inserted lining block, and a wedge for holding the end block in said groove, said wedge engaging a recess in a side wall of the groove.

4. A drive pulley with grooved rim and diagonally subdivided lining blocks circumferentially means including an end block closing the gap,

between the first and the'last inserted lining block, and a wedge of similar material to that of the lining blocks for holding the end block in said groove, said wedge engaging a recess in a side wall of the groove.

EMIL UFFELMANN. 

